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Example code of karmabunny/rdb

Informations about the package rdb

Rdb

Like Pdb, but for Redis. I guess.

Big emphasis on prefixing keys and object serialization.

Also because I don't want a hard dependency on either predis or php-redis. They both have their problems (vague magical commands API, binary extension, etc). Or wouldn't it be wonderful if a 3rd option showed up /s. Also supports credis.

Install

Add as a dependency:

Adapters

This library doesn't implement a redis client itself, only wraps existing clients. After much effort trying to normalise the responses from all these client, it might seem like a good idea to just write our own that isn't so inconsistent.

But consider that we only know how inconsistent these libraries are because we've spent so much time trying to make them all behave the same. For example, client 'A' might do 'B' well but 'C' badly. Then client 'D' does 'B' badly but 'C' really well.

So as I sit here and scoff at their feeble attempts, I am reminded of a few things:

  1. I've already introduced so many of my own bugs during this journey.
  2. Unit testing is a gift from heaven.
  3. Normalising these inconsistencies has improved our own consistency, something probably not as achievable when writing a new client from scratch.
  4. also this: https://xkcd.com/927

Version support

This wrapper doesn't try to polyfill any missing features. It targets Redis server v3.0, as that's the common support among all the adapters.

This library wouldn't ever try to hide features behind target versions, but perhaps it could help smooth out any differences. Lua scripting could polyfill a lot of things tbh.

For example, BRPOPLPUSH is deprecated in v6.2 and might be removed in the distant future. In this case, the library would be able to dynamically replace (based on the server version) this with BLMOVE.

Plans for v2

There is a preference for the millisecond version of a command, particularly TTL parameters. This is clearly misleading and already wildly inconsistent. Ideally this changes so that a 'float' is converted to the millisecond version and integer remains unchanged. Thus the input is always 'seconds'.

Type errors are currently (hopefully) always a null return. This can quite confusing at times, or helpful in others. Version 2 will likely permit both, defaulting to emitting exceptions.

Config

Notes:

Usage

Basic usage with a TTL. Great for caching.

Object extensions will serialize in the PHP format. These have builtin assertions so things are always the correct shape.

Locking provides a mechanism to restrict atomic access to a resource.

Leaky bucket is a rate-limiting algorithm. It's cute, easy to understand, and not too complex.

Contributing

Submit a PR if you like. But before you do, please do the following:

  1. Run composer analyse and fix any complaints there
  2. Run composer compat and fix those too
  3. Write some tests and run composer tests
  4. Document the methods here

Methods

Core Methods

TODO: more

sets:

Extended Methods

Builtin Utilities

TODOs

All versions of rdb with dependencies

PHP Build Version
Package Version
Requires predis/predis Version ^2.2
colinmollenhour/credis Version ^1
php Version >=7.2
symfony/polyfill-php73 Version ^1.29
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